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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
During REM, the activity of the brain's neurons is quite similar to that during waking hours; for this reason, the REM-sleep stage may be called paradoxical sleep. REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep.